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Unread 07-08-2013, 10:25 AM   #1
andrealphus
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Drivin cross country, lets hope I make it...

Started driving across country a few days ago (RI to Los Angeles), and somewhere in VA I noticed the jeep (01 TJ) was pushing a lot of coolant, with vigorous bubbling in the coolant overflow reservoir. Seems to only happen when it's very hot out. My first guess was the thermostat or head gasket. I replaced the thermo last year.

There also seems to be what can only be engine coolant leaking out of one of the ac pressure ports (the one right above the thermostat). If I unscrew the cap of that ac port i can see coolant and gas slowly bubbeling out.

I normally don't use my ac, by I've got a 5 month old puppy with me, so the ac is crucial.

I had it recharged before I left, and they said I do likely have an ac leak somewhere since it was so low. They didn't put in a sealer with the recharge but I'm carrying a couple cans of sealer and freon with me.

Is it possible somehow to have engine coolant leak through into the ac? I thought they were isolated systems..

I do all my own maintenance, but when it comes to the ac I'm lost.

(Somewhere at a Chik-fila parking lot in Kentucky...)

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Unread 07-08-2013, 04:15 PM   #2
WhiteMtnJeep
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Coolant can not leak out of the AC system, they are not connected. The refrigerant will look greenish when it leaks because of the lube and dye.
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Unread 07-11-2013, 08:39 AM   #3
caiha
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Quote:
Originally Posted by andrealphus
Started driving across country a few days ago (RI to Los Angeles), and somewhere in VA I noticed the jeep (01 TJ) was pushing a lot of coolant, with vigorous bubbling in the coolant overflow reservoir. Seems to only happen when it's very hot out. My first guess was the thermostat or head gasket. I replaced the thermo last year.

There also seems to be what can only be engine coolant leaking out of one of the ac pressure ports (the one right above the thermostat). If I unscrew the cap of that ac port i can see coolant and gas slowly bubbeling out.

I normally don't use my ac, by I've got a 5 month old puppy with me, so the ac is crucial.

I had it recharged before I left, and they said I do likely have an ac leak somewhere since it was so low. They didn't put in a sealer with the recharge but I'm carrying a couple cans of sealer and freon with me.

Is it possible somehow to have engine coolant leak through into the ac? I thought they were isolated systems..

I do all my own maintenance, but when it comes to the ac I'm lost.

(Somewhere at a Chik-fila parking lot in Kentucky...)
Replace thermostat. It may not be opening and look for a collapsed hose possibly.
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Unread 07-11-2013, 10:31 AM   #4
biffgnar
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Quote:
Originally Posted by FernBchJeep View Post
Coolant can not leak out of the AC system, they are not connected. The refrigerant will look greenish when it leaks because of the lube and dye.
If he's leaking coolant it should be orange. Although I agree coolant in AC makes no sense.
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Unread 07-11-2013, 11:30 AM   #5
caiha
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Quote:
Originally Posted by biffgnar

If he's leaking coolant it should be orange. Although I agree coolant in AC makes no sense.
Yea the green stuff from the a/c would be dye from the recharge. They have to see if there is a leak before recharging.
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Unread 07-12-2013, 05:14 AM   #6
jeepdaddy2000
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If an AC port is bubbling, the the valve is leaking. The bubbling is probably the oil in the system being discharged. The valve may eventually need to be replaced and the system recharged. This won't cause the engine to overheat.
Know that bubbling in the coolant tank is normal. Check the temp with an IR gun to insure what the block/radiator temp is.
If the temp is good, I would be to replace the radiator cap.
Remember, the engine will run hotter with the AC on due to the added strain and the condenser tossing heat on the radiator.
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Unread 07-13-2013, 10:58 PM   #7
Chuck59
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Change radiator cap.
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